1 # SPDX-License-Identifier: GPL-2.0
5 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
6 select ARCH_BINFMT_ELF_STATE
7 select ARCH_ENABLE_MEMORY_HOTPLUG
8 select ARCH_ENABLE_MEMORY_HOTREMOVE
9 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
10 select ARCH_HAS_PHYS_TO_DMA
11 select ARCH_HAS_PTE_SPECIAL
12 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
13 select ARCH_INLINE_READ_LOCK if !PREEMPTION
14 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
15 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
16 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
17 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
18 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
19 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
21 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
22 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
23 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
24 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
25 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
26 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
27 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
28 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
29 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
30 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
31 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
32 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
33 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
34 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
35 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
36 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
37 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
38 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
39 select ARCH_MIGHT_HAVE_PC_PARPORT
40 select ARCH_MIGHT_HAVE_PC_SERIO
41 select ARCH_SPARSEMEM_ENABLE
42 select ARCH_SUPPORTS_ACPI
43 select ARCH_SUPPORTS_ATOMIC_RMW
44 select ARCH_SUPPORTS_HUGETLBFS
45 select ARCH_SUPPORTS_NUMA_BALANCING
46 select ARCH_USE_BUILTIN_BSWAP
47 select ARCH_USE_CMPXCHG_LOCKREF
48 select ARCH_USE_QUEUED_RWLOCKS
49 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
50 select ARCH_WANTS_NO_INSTR
51 select BUILDTIME_TABLE_SORT
53 select GENERIC_CLOCKEVENTS
54 select GENERIC_CMOS_UPDATE
55 select GENERIC_CPU_AUTOPROBE
57 select GENERIC_FIND_FIRST_BIT
58 select GENERIC_GETTIMEOFDAY
59 select GENERIC_IRQ_MULTI_HANDLER
60 select GENERIC_IRQ_PROBE
61 select GENERIC_IRQ_SHOW
62 select GENERIC_LIB_ASHLDI3
63 select GENERIC_LIB_ASHRDI3
64 select GENERIC_LIB_CMPDI2
65 select GENERIC_LIB_LSHRDI3
66 select GENERIC_LIB_UCMPDI2
67 select GENERIC_PCI_IOMAP
68 select GENERIC_SCHED_CLOCK
69 select GENERIC_SMP_IDLE_THREAD
70 select GENERIC_TIME_VSYSCALL
72 select HAVE_ARCH_AUDITSYSCALL
73 select HAVE_ARCH_COMPILER_H
74 select HAVE_ARCH_MMAP_RND_BITS if MMU
75 select HAVE_ARCH_SECCOMP_FILTER
76 select HAVE_ARCH_TRACEHOOK
77 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
78 select HAVE_ASM_MODVERSIONS
79 select HAVE_CONTEXT_TRACKING
80 select HAVE_COPY_THREAD_TLS
81 select HAVE_DEBUG_STACKOVERFLOW
82 select HAVE_DMA_CONTIGUOUS
83 select HAVE_EXIT_THREAD
85 select HAVE_GENERIC_VDSO
86 select HAVE_IOREMAP_PROT
87 select HAVE_IRQ_EXIT_ON_IRQ_STACK
88 select HAVE_IRQ_TIME_ACCOUNTING
90 select HAVE_MEMBLOCK_NODE_MAP
91 select HAVE_MOD_ARCH_SPECIFIC
93 select HAVE_PERF_EVENTS
94 select HAVE_REGS_AND_STACK_ACCESS_API
96 select HAVE_SETUP_PER_CPU_AREA if NUMA
97 select HAVE_SYSCALL_TRACEPOINTS
99 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP
100 select IRQ_FORCED_THREADING
101 select IRQ_LOONGARCH_CPU
102 select MODULES_USE_ELF_RELA if MODULES
103 select NEED_PER_CPU_EMBED_FIRST_CHUNK
104 select NEED_PER_CPU_PAGE_FIRST_CHUNK
106 select OF_EARLY_FLATTREE
107 select PERF_USE_VMALLOC
110 select SYSCTL_EXCEPTION_TRACE
112 select TRACE_IRQFLAGS_SUPPORT
113 select USE_PERCPU_NUMA_NODE_ID
126 config CPU_HAS_PREFETCH
130 config GENERIC_CALIBRATE_DELAY
136 config GENERIC_HWEIGHT
139 config L1_CACHE_SHIFT
143 config LOCKDEP_SUPPORT
147 # MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the
148 # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that
149 # are shared between architectures, and specifically expecting the symbols.
150 config MACH_LOONGSON32
153 config MACH_LOONGSON64
159 config PAGE_SIZE_16KB
162 config PAGE_SIZE_64KB
165 config PGTABLE_2LEVEL
168 config PGTABLE_3LEVEL
171 config PGTABLE_4LEVEL
174 config PGTABLE_LEVELS
176 default 2 if PGTABLE_2LEVEL
177 default 3 if PGTABLE_3LEVEL
178 default 4 if PGTABLE_4LEVEL
180 config SCHED_OMIT_FRAME_POINTER
184 menu "Kernel type and options"
186 source "kernel/Kconfig.hz"
189 prompt "Page Table Layout"
190 default 16KB_2LEVEL if 32BIT
191 default 16KB_3LEVEL if 64BIT
193 Allows choosing the page table layout, which is a combination
194 of page size and page table levels. The size of virtual memory
195 address space are determined by the page table layout.
198 bool "4KB with 3 levels"
200 select PGTABLE_3LEVEL
202 This option selects 4KB page size with 3 level page tables, which
203 support a maximum of 39 bits of application virtual memory.
206 bool "4KB with 4 levels"
208 select PGTABLE_4LEVEL
210 This option selects 4KB page size with 4 level page tables, which
211 support a maximum of 48 bits of application virtual memory.
214 bool "16KB with 2 levels"
215 select PAGE_SIZE_16KB
216 select PGTABLE_2LEVEL
218 This option selects 16KB page size with 2 level page tables, which
219 support a maximum of 36 bits of application virtual memory.
222 bool "16KB with 3 levels"
223 select PAGE_SIZE_16KB
224 select PGTABLE_3LEVEL
226 This option selects 16KB page size with 3 level page tables, which
227 support a maximum of 47 bits of application virtual memory.
230 bool "64KB with 2 levels"
231 select PAGE_SIZE_64KB
232 select PGTABLE_2LEVEL
234 This option selects 64KB page size with 2 level page tables, which
235 support a maximum of 42 bits of application virtual memory.
238 bool "64KB with 3 levels"
239 select PAGE_SIZE_64KB
240 select PGTABLE_3LEVEL
242 This option selects 64KB page size with 3 level page tables, which
243 support a maximum of 55 bits of application virtual memory.
248 string "Built-in kernel command line"
250 For most platforms, the arguments for the kernel's command line
251 are provided at run-time, during boot. However, there are cases
252 where either no arguments are being provided or the provided
253 arguments are insufficient or even invalid.
255 When that occurs, it is possible to define a built-in command
256 line here and choose how the kernel should use it later on.
259 prompt "Kernel command line type"
260 default CMDLINE_BOOTLOADER
262 Choose how the kernel will handle the provided built-in command
265 config CMDLINE_BOOTLOADER
266 bool "Use bootloader kernel arguments if available"
268 Prefer the command-line passed by the boot loader if available.
269 Use the built-in command line as fallback in case we get nothing
270 during boot. This is the default behaviour.
272 config CMDLINE_EXTEND
273 bool "Use built-in to extend bootloader kernel arguments"
275 The command-line arguments provided during boot will be
276 appended to the built-in command line. This is useful in
277 cases where the provided arguments are insufficient and
278 you don't want to or cannot modify them.
281 bool "Always use the built-in kernel command string"
283 Always use the built-in command line, even if we get one during
284 boot. This is useful in case you need to override the provided
285 command line on systems where you don't have or want control
291 bool "Enable DMI scanning"
292 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
295 This enables SMBIOS/DMI feature for systems, and scanning of
296 DMI to identify machine quirks.
299 bool "EFI runtime service support"
301 select EFI_PARAMS_FROM_FDT
302 select EFI_RUNTIME_WRAPPERS
304 This enables the kernel to use EFI runtime services that are
305 available (such as the EFI variable services).
308 bool "Multi-Processing support"
310 This enables support for systems with more than one CPU. If you have
311 a system with only one CPU, say N. If you have a system with more
314 If you say N here, the kernel will run on uni- and multiprocessor
315 machines, but will use only one CPU of a multiprocessor machine. If
316 you say Y here, the kernel will run on many, but not all,
317 uniprocessor machines. On a uniprocessor machine, the kernel
318 will run faster if you say N here.
320 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>.
322 If you don't know what to do here, say N.
325 bool "Support for hot-pluggable CPUs"
327 select GENERIC_IRQ_MIGRATION
329 Say Y here to allow turning CPUs off and on. CPUs can be
330 controlled through /sys/devices/system/cpu.
331 (Note: power management support will enable this option
332 automatically on SMP systems. )
333 Say N if you want to disable CPU hotplug.
336 int "Maximum number of CPUs (2-256)"
341 This allows you to specify the maximum number of CPUs which this
347 select ACPI_NUMA if ACPI
349 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access)
350 support. This option improves performance on systems with more
351 than one NUMA node; on single node systems it is generally better
352 to leave it disabled.
359 config FORCE_MAX_ZONEORDER
360 int "Maximum zone order"
361 range 14 64 if PAGE_SIZE_64KB
362 default "14" if PAGE_SIZE_64KB
363 range 12 64 if PAGE_SIZE_16KB
364 default "12" if PAGE_SIZE_16KB
368 The kernel memory allocator divides physically contiguous memory
369 blocks into "zones", where each zone is a power of two number of
370 pages. This option selects the largest power of two that the kernel
371 keeps in the memory allocator. If you need to allocate very large
372 blocks of physically contiguous memory, then you may need to
375 This config option is actually maximum order plus one. For example,
376 a value of 11 means that the largest free memory block is 2^10 pages.
378 The page size is not necessarily 4KB. Keep this in mind
379 when choosing a value for this option.
382 bool "Enable seccomp to safely compute untrusted bytecode"
386 This kernel feature is useful for number crunching applications
387 that may need to compute untrusted bytecode during their
388 execution. By using pipes or other transports made available to
389 the process as file descriptors supporting the read/write
390 syscalls, it's possible to isolate those applications in
391 their own address space using seccomp. Once seccomp is
392 enabled via /proc/<pid>/seccomp, it cannot be disabled
393 and the task is only allowed to execute a few safe syscalls
394 defined by each seccomp mode.
396 If unsure, say Y. Only embedded should say N here.
400 config ARCH_SELECT_MEMORY_MODEL
403 config ARCH_FLATMEM_ENABLE
407 config ARCH_SPARSEMEM_ENABLE
410 Say Y to support efficient handling of sparse physical memory,
411 for architectures which are either NUMA (Non-Uniform Memory Access)
412 or have huge holes in the physical address space for other reasons.
413 See <file:Documentation/vm/numa.rst> for more.
415 config ARCH_ENABLE_THP_MIGRATION
417 depends on TRANSPARENT_HUGEPAGE
419 config ARCH_MEMORY_PROBE
421 depends on MEMORY_HOTPLUG
427 config ARCH_MMAP_RND_BITS_MIN
430 config ARCH_MMAP_RND_BITS_MAX
433 menu "Power management options"
435 source "drivers/acpi/Kconfig"
439 source "drivers/firmware/Kconfig"